A study, published in AERA Open, a peer-reviewed journal of the American Educational Research Association, explored the early development of gender gaps in mathematics achievement, including when gaps first appear, where in the distribution they develop, and whether these gaps have changed over the years.
Cimpian and colleagues compared two cohorts in the US Early Childhood Longitudinal Study: the kindergarten (Year 1) classes of 1998-1999 (N = 21,399) and 2010-2011 (N = 18,170). They observed that the gender gap at the top of the distribution (among the highest achievers in maths) begins in early elementary school (Year 2) and continues to get worse, and has not improved over the last decade. In both the 1998-1999 and 2010-2011 cohorts, girls represented less than one-third of students above the 99th percentile as early as the spring of kindergarten. By Grade 3 (Year 4) for the 1998-1999 cohort and Grade 2 (Year 3) for the 2010-2011 cohort, girls made up only one-fifth of those above the 99th percentile.
In addition to maths achievement, students’ learning behaviours and teacher expectations were examined, as these could be two potential contributors to the gender gaps. When boys and girls behaved and performed similarly, teachers in both cohorts underrated the maths skills of girls as early as Grade 1 (Year 2). In other words, in mathematics, for teachers to rate girls equally with boys, girls must work harder and behave better than the boys.
Source: Have gender gaps in math closed? Achievement, teacher perceptions, and learning behaviors across two ECLS-K cohorts (2016), AERA Open